Which of the following would NOT be considered a leap of logic?

That dagger had never been in the possession of the pacific and taciturn Hans. I knew him and his habits, too well.
It was so like our starting point, that I could scarcely doubt the reality of our position.
“Not at all. There is a very simple explanation, Harry. ...this must have belong to Hans”
“Harry,” he cried, “we are now on the verge of a great discovery.”
None of the above

None of the above would NOT be considered a leap of logic.